Completly Different/Separate Email Notifications/Sound

Ok I have looked and looked and probable over looked the post/forum that states How to make all my Email accounts have a different notification sound from one another ie.. "Aol will go beep" "Gmail will go bong" Yahoo will go blurp" and the work email will go "you have a message from the dark side" in yodas voice. I have tried going into each account but gmail seeems to be the only one that is completely separate from the rest and will stay at the selected notification sound? Any info on what i am missing or an app that is needed to obtain what i am looking for? Please email me or just post i will be checking